Na pięknej wyspie Oahu zjawia się sześć obcych sobie osób, które w ramach nowego reality show połączy teraz wspólny dom, liczne konflikty i zupełny brak scenariusza.
Three new boys (Makoto, Yuki, Uchi) and three new girls (Minori, Mizuki, Yuriko) move in the Terrace House. After introducing themselves to each other, they go grocery shopping and then have their first dinner together in the house.
Mizuki cooks dinner for everybody. While having dinner, they plan for Yuki's upcoming birthday party. Afterwards, the girls reveal to themselves that each of them is interested in Makoto.
Minori and Makoto go on a night jog. At Yuki's birthday party, he starts asking everyone about their future plans. When he's dissatisfied with Mizuki's answer, both Mizuki and Yuriko become upset and start crying.
Makoto and Minori go to a yakiniku restaurant; Yuriko and Yuki go out drinking sake together. Makoto reveals to the group that he's afraid he won't make it as a professional baseball player.
Uchi openly asks all three girls out on separate dates. Makoto goes to Uchi's hair salon to get a haircut. Minori, Makoto, and Yuki go to a fish restaurant where Makoto reveals that Uchi is planning to take Yuriko to the aquarium, just like Yuki's plan.
Uchi and Mizuki go on a date to Leisure Land. At his date with Yuriko, however, the Enoshima aquarium was already closed, so they have a drink instead. The whole group goes to see Yuki tap dance and everybody is very impressed with his performance. Uchi tells Makoto about his nervousness at his date with Yuriko; but behind his back, Makoto tattles about this to Yuriko and makes her feel confused.
Uchi confronts Makoto about his actions, but Makoto doesn't seem to be remorseful. Uchi goes on a date with Minori, and Yuriko goes to the Sumida aquarium with Yuki. They then plan to go to Blue Note together at some other time. Makoto tells Yuriko that he used to have feelings for Minori, but not any more.
Makoto sends a text message to Minori, telling her that he still likes her, despite what he said to Yuriko. This makes all three girls to turn against him. The group decides that nobody should sleep in the living room, since it prevents others from using it. Uchi asks Minori out on another date.
Minori has lunch with her sister, Kurumi. Uchi reveals his feelings to Minori, but doesn't expect an immediate answer. Makoto gives Minori a new pair of shoes and they go jogging again. Yuki and Yuriko go to Blue Note, but afterwards she tells him that she wants to reconcile with her ex-boyfriend.
Minori makes it clear to Makoto that she doesn't want to go out with him again. Yuriko asks her ex if they can get back together again, but he tells her to concentrate on her exams first. Uchi gives Minori a beauty treatment at his hair salon and she cooks him spaghetti. Makoto decides to leave the house after baseball season is over.
Both Minori and Uchi work at the GirlsAward fashion show, Minori as a model and Uchi as a hair stylist. The group sees Makoto off and welcomes a new member from Hawaii, Arman. Yuriko tells the group that whatever happens with her and her ex, she plans to leave the house soon.
Arman applies for a job as an English teacher, then goes to practice kickboxing at Target gym. He also goes on a date with Mizuki to the beach. Uchi tells Minori about his feelings again, but Minori says that she's not ready to make any decision.
Yuriko's ex makes it clear to her that he doesn't see any future with her. The following morning, she leaves the house. Minori's sister Kurumi comes to drop some relationship advice on Minori and Uchi. A new member joins the group, Arisa from Kagoshima.
Arman is getting close to Arisa and they plan to go to the gym together. Since Minori feels that her relationship with Uchi is going nowhere, she decides to send him a message via omurice. Uchi then tries to prove her wrong. In the process, they officially become a couple.
Arman goes to a kickboxing training session with Arisa. Before they go hiking on Mount Takao, Arisa prepares a bento to eat at the summit. Mizuki decides to take initiative and asks Arman out for dinner.
When Yuki asks Arisa if she wants to go on a day trip with her, she turns him down. At Mizuki's dinner with Arman, he tells her that he has feelings for Arisa. Both Yuki and Mizuki then decide to leave Terrace House.
The group finds a Japanese-style room upstairs and suggests that Minori and Uchi sleep there instead of in the living room. Arman wins his first amateur kickboxing match in Japan. The next day, the group bids farewell to Mizuki and Yuki.
Minori and Uchi discuss their communication problem. Arman applies for a job at the Kamakura Loco Mart and Garden. He then goes on a date with Arisa to Yomiuriland despite feeling hungover.
Arisa tells Arman that she sees him more as a brother than a boyfriend, which upsets him. However, they are able to clear the air afterwards. After Christmas break, Minori and Arman are the only members who are present to welcome new members Hikaru and Natsumi.
Both Uchi and Arisa come back from their Christmas holiday and make the group complete again. Minori is annoyed by Nacchan's light teasing of Minori and Uchi's relationship. Hikaru and Arman discuss their situation to avoid treading on each other's toes.
Arman is looking for a way to give Arisa more attention, so Uchi suggests that Arman cook for her. However, Arman prepares the dish together with Nacchan. This causes further misunderstanding between Minori and Nacchan that leads to a house meeting with all six members present.
Minori plans to leave the house when she graduates from college, which is only a couple of weeks away. Uchi is dismayed that the group cooked and ate the hidagyu meat that he got as a present from a highly valued client.
Uchi refuses to talk to anybody and goes to bed directly after work. The only person he is willing to talk to is Kurumi, who happens to be visiting. She mediates between him and Minori, and after a long talk, they finally reconcile. Arman asks Arisa about her feelings toward him, but she uses work as an argument against any relationship.
Nacchan and Minori prepare some Valentine's Day cookies for the boys. The group then goes out with Uchi and Minori for the last time before they leave. After a fun day of snowboarding and dinner, they send the couple off in the morning. Misaki Tamori is the next member who arrives. She is an entertainer who dreams of building her own amusement park.
While the group is having yakiniku dinner at a restaurant, the conversation turns to Misaki's ex-boyfriend, and Hikaru displays his displeasure at this topic. She thinks his behavior is immature, but changes her mind later when Hikaru apologizes. Arisa asks Han-san's help in designing displays for her hat exhibition.
Misaki and Hikaru are having so much fun at their bike ride that they already plan for their next date at the hot springs. Nacchan and Han-san find out that they both love fishing, so they plan to do that together. While the group is helping Arisa prepare for her exhibition, she announces that she's leaving the house soon.
The new member who replaces Arisa is Riko, a high school student who just won a national beauty pageant. She goes shopping with Misaki, because Misaki wants to buy a nightgown to impress Hikaru. When she wears the nightgown in front of Hikaru, however, the situation turns awkward. When the group has dinner to welcome Riko, Nacchan's discussion of nightgowns rubs Misaki the wrong way.
Nacchan comes to Han-san's studio and asks him for advice on her situation with Misaki. Han-san tells her that she has to be more considerate with others, especially her housemates. Based on his advice and her conversation with Riko, Nacchan apologizes to Misaki. While on a date in Yokohama, Misaki uses the opportunity to declare her feelings to Hikaru.
Misaki and Hikaru's date ends on a sad note as he rejects her. They return to the house very late and the others have been waiting for them. Nacchan gets so worried that she starts drinking while waiting. When Misaki makes a comment about it, Nacchan is irked and worries that the comment would affect her career. Another lengthy house meeting follows, where the matter is resolved. Nevertheless, Nacchan feels that it's time for her to leave the house. At the barbecue party the following night, Hikaru also announces his intention to leave.
The barbecue party continues and Misaki shares one last talk with Hikaru. Arman also seems to be quite affected by Hikaru's exit. The group does not have to wait long for new members, as both Momoka and Hayato arrive before long. Momoka is a ballerina and Hayato is a chef-in-training.
Hayato cooks hayashi rice for the girls. The next day, he goes on a date with Riko to the meat festival. While the group goes out to a restaurant, Hayato gets emotional when talking about his own dashed dream of becoming an actor. Riko applies for a job at Shibuya 109 but is not confident about her chances. Poolside, the group surprises Momoka with a birthday cake. The boys then go for a swim for the first time in the year.
Hayato goes on another date with Riko, this time to Tsukiji fish market. Han-san's architecture design for building facilities for physically disabled people does not win the competition, but he's happy that the girls visit him at the exhibition. Riko and Misaki congratulates him for a job well done by cooking him a meal. While cleaning the pool, Han-san explains to Misaki and Arman that it's time for him to leave. He is very touched to receive a photo album of his time at the house as a farewell gift.
Yuki and Misaki's date goes very well and they have a long talk. Momoka is feeling anxious about an upcoming ballet competition. It's a very important competition, because finishing in the top three would secure her a professional career. She apologizes to Arman for backing out of their date to focus more on training. Riko and Hayato go to the Cup Noodles museum in Yokohama. Afterwards, she has a discussion with the girls about relationships and Riko reveals that she refuses to hold hands with a person who's not her boyfriend.
Because Misaki helps Yuki prepare for an upcoming driver's license test, he promises to take her out with the car when he passes. However, he comes home one night having failed the test. Hayato invites Yuki and Arman to his restaurant after hours and cooks for them. He expresses uncertainty about his relationship with Riko, because they have differing views on their relationship. Momoka finishes sixth at the ballet competition and is quite frustrated at herself. However, she got an offer from a ballet company anyway and starts her professional career in a week. After ...
Momoka meets with the artistic director of her new ballet company, and he gives her encouragement for her career. To concentrate on this new task, she tearfully leaves the house. While the group is playing Jenga, a new member named Masako arrives. She calls herself Martha and does modeling while aspiring to be a childcare worker. Although privately she feels drawn to Hayato, she says yes to Arman when he asks her out.
Hayato teaches Martha to cook a pasta dish. He tells her that his relationship with Riko is on hold at the moment and he thinks of her more as a sister. Riko signs a contract with an agency with her mom as her guardian. Riko's mom then surprises everybody by visiting the house. Yuki finally passes his driver's license test and plans a date with Misaki.
Yuki takes Misaki to Yokohama for the promised date. She wears the white dress that he gave her for her birthday. He repeats his love declaration to her and she accepts. They then come home and announce their relationship to the rest of the group. All six of them go on a camping trip to Nagatoro, Saitama. Arman takes Martha aside and says he wants to get to know her better. Meanwhile, Hayato and Riko have a long conversation that brings them closer again.
Riko and Hayato both wear yukata for their date at the fireworks festival. Afterwards, they tell the group that nothing special happened at the date. Afterwards, in the dining room, he tells her to concentrate on her career instead of dating him. Meanwhile, Yuki reveals to Misaki that he saw Hayato kissing Riko off-camera before the yukata date. He speculates that they hide their real relationship from the viewers and the other housemates to protect Riko's budding career. Arman also notices that sometimes when he wakes up in the middle of the night, he would see Riko ...
At the house meeting, Hayato keeps mostly silent and lets Riko explain the situation. She thinks that this is not very manly. She also thinks that he's only using both their careers as a way out. Riko and Hayato separately apologize to Martha for their deception. Martha goes on a date with Arman to the beach. During a boat ride, he asks her to be his girlfriend. She feels some reservation because Arman might be leaving home for Hawaii soon.
After Arman explains to Martha that he might stay in Japan if their relationship goes well, she accepts his love declaration. Hayato gets some relationship advice from his boss at the restaurant. This makes him decide to win Riko back. Riko is going back to her hometown for five days for a job, but Hayato asks her to come to the restaurant right afterwards because he's making a special dessert for her. Arman says goodbye to his colleagues at Kamakura Loco Mart and they thank him for being a hard worker.
While the rest of the group is celebrating Martha's birthday, Hayato waits anxiously at his restaurant for Riko's arrival. However, Riko goes straight from the train station back to Terrace House. Han-san and Nacchan drop by for a surprise visit. The group spends time together for the last time, cleaning the house, packing their belongings, swimming in the pool, and having a barbecue party.